About the show

Sponsored by InfluxDB from Influxdata.

Connect with the hosts

• Michael: @mkennedy@fosstodon.org
• Brian: @brianokken@fosstodon.org
• Show: @pythonbytes@fosstodon.org

Join us on YouTube at pythonbytes.fm/live to be part of the audience. Usually Tuesdays at 11am PT. Older video versions available there too.

Brian #1: huak - A Python package manager written in Rust. Inspired by Cargo

• Suggested by Owen
• Tons of workflows
  • activate - activate a virtual environment
  • add add a dependency to a project
    • pip install it into your virtual environment, and add it to the dependency list in pyproject.toml
  • test - run pytest
  • update update dependencies
  • lint - run ruff, installing it first if necessary
  • fix - autofix fixable lint conflicts
  • build - build wheel in isolated virtual environment using hatchling
• Honestly
  • I was considering building my own workflow tool, but this is darned close to what I want.
  • Even though it’s still “in an experimental state”.
  • There are rough edges (ruff edges, get it), but still, way cool.
  • I just don’t know how to pronounce it. Is it like “walk”, or more like “whack”?

Michael #2: eus-proposed-cra-law-may-have.html">PSF expresses concerns about a proposed EU law that may make it impossible to continue providing Python and PyPI to the European public

• After reviewing the proposed strategy.ec.europa.eu/en/library/cyber-resilience-act">Cyber Resilience Act and lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A52022PC0495">Product Liability Act, the PSF has found issues that put the mission of our organization and the health of the open-source software community at risk.
• As currently written, the authors of open-source components might bear legal and financial responsibility for the way their components are applied in someone else’s commercial product.
• The risk of huge potential costs would make it impossible in practice for us to continue to provide Python and PyPI to the European public.

Brian #3: ChaosToolkit

• Suggested by the maintainer, Sylvain Hellegouarch
• Declare and store your Chaos Engineering experiments as JSON/YAML files so you can collaborate and orchestrate them as any other piece of code.
• Extensible through an Open API
• Can be automated in CI/CD pipeline

Michael #4: PEP 711 – PyBI: a standard format for distributing Python Binaries

• “Like wheels, but instead of a pre-built python package, it’s a pre-built python interpreter”

Joke: It’s the effort that counts

About the show

Sponsored by InfluxDB from Influxdata.

Connect with the hosts

• Michael: @mkennedy@fosstodon.org
• Brian: @brianokken@fosstodon.org
• Show: @pythonbytes@fosstodon.org

Join us on YouTube at pythonbytes.fm/live to be part of the audience. Usually Tuesdays at 11am PT. Older video versions available there too.

Michael #1: makeapp

• via Felix Ingram
• Simplifies Python application rollout and publishing.
• Link to its mention on Talk Python.
• Simplifies Python application rollout and publishing:
  • Make a skeleton for your new application with one console command
  • Automatically create a VCS repository for your application.
  • Automatically check whether the chosen application name is not already in use.
  • Customize new application layouts with skeleton templates.
  • Put some skeleton default settings into a configuration file not to mess with command line switches anymore.
  • Easily add entries to your changelog.
  • Publish your application to remotes (VCS, PyPI) with single command.

Brian #2: Looking forward to Python 3.12

• We’re on 3.12.0a7 now, the last alpha, final is scheduled for October
  • schedule
• So far, in 3.12.0a7
• What’s new in Python 3.12 page has some examples of the Improved Error Messages
• Recent addition, PEP 684 - A Per-Interpreter GIL was approved recently
  • “… sufficient isolation would facilitate true multi-core parallelism …” seems like a good thing.
  • But also, “… this is an advanced feature meant for a narrow set of users of the C-API. “, so not really sure how this will affect us.
  • Still, seems cool.

Michael #3: Python 3.11.3 is out

• Fixes a HIGH level CVE in OpenSSL (so patch it)
• Lots of changes in Core and Builtins

Brian #4: How to Make a Great Conference Talk

• Sebastian Witowski
• Lots of great advice for tech conf talks.
• Don’t skip the last half of this, getting your talk accepted is really when the work starts.
• Good sections to make sure you don’t miss
  • Live demos
    • “First of all - do you really need a demo? …”
  • Rehearsing
    • Don’t skip this. Do this. A lot. Out loud. With a timer. While standing.
    • Memorize the first few minutes, and the last few.
    • Know how you’re going to open and close.
  • Night before
    • get enough sleep
  • Day of
    • eat well. Don’t drink too much liquids. Be comfortable.
• Sebastian was honest in saying this stuff works for him, but do what works for you.
• From Brian:
  • I deviate from Sebastian in quite a few places, but still don’t disagree with his advice.
  • I can’t give a talk without slides, as I use them for prompts to know what I’m talking about next.
    • My talks usually have a lot of code snippets. Obviously, that would be difficult without slides.
    • I write my talk and my slides in Markdown. Sebastian writes in something else, then builds slides as visual aids. That’s cool.
    • Do what works for you.
• Bonus tool from the article:
  • demo-magic - If I’m ever tempted to live code again, I think I’ll try this instead.

Extras

Michael:

• NOW the CDN course is out.
• Django 4.2 released.

Joke:

• Using A.I. for Efficiency

About the show

Sponsored by Influxdb

Connect with the hosts

• Michael: @mkennedy@fosstodon.org
• Brian: @brianokken@fosstodon.org
• Show: @pythonbytes@fosstodon.org

Join us on YouTube at pythonbytes.fm/live to be part of the audience. Usually Tuesdays at 11am PT. Older video versions available there too.

Brian #1: Pydantic V2 Pre Release

• Terrence Dorsey & Samuel Colvin
• Alpha release available to everyone: pip install --pre -U "pydantic>=2.0a1"
• Headlines:
  • pydantic-core - all validation logic rewritten in Rust and moved to separate package, pytest-core
    • 5-50x faster
    • separation will aid safety and maintainability
• Lots ready for experimentation
  • BaseModel, Dataclasses, Serialization, …
• Much still under construction
  • Docs, BaseSettings→ pydantic-settings, …

Michael #2: microdot The impossibly small web framework for Python and MicroPython

• Microdot is a minimalistic Python web framework inspired by Flask, and designed to run on systems with limited resources such as microcontrollers.
• It runs on standard Python and on MicroPython.
• Support for async, websockets, tls, even ASGI servers.
• python-static.nyc3.digitaloceanspaces.com/flask-vs-microdot-mem.png">Less mem usage by a big margin.

Brian #3: GitHub Actions Tools: watchgha, build and inspect, and pytest annotate failures

• watchgha
  • Ned Batchelder
  • Watch GH Actions progress on the command line
• build-and-inspect-python-package
  • Hynek
  • Test the build of wheels, check contents, lint README
  • print sdist contents, wheel contents, and metadata
• pytest-github-actions-annotate-failures
  • utgwkk
  • Nice traceback annotations for pytest

Michael #4: PEP 709 – Inlined comprehensions

• by Carl Meyer
• Comprehensions are currently compiled as nested functions, which provides isolation of the comprehension’s iteration variable, but is inefficient at runtime.
• This PEP proposes to inline list, dictionary, and set comprehensions into the code where they are defined, and provide the expected isolation by pushing/popping clashing locals on the stack.
• This change makes comprehensions much faster: up to 2x faster for a microbenchmark of a comprehension alone.

Extras

Michael:

• Python Web Apps that Fly with CDNs Course

Joke: Can’t watch movies

About the show

Sponsored by Microsoft for Startups Founders Hub.

Michael #1: Prefix-cache

• via Brendan Hannigan
• You can set an environment variable or use it as a command line argument and then instead of creating tons of __pycache__ folders to store your *.pyc files right next to the source code, it puts them in some specified folder.
• Introduced in python 3.8.

Brian #2: NiceGUI

• Suggested by several listeners
• Browser based GUI
• “NiceGUI is an easy-to-use, Python-based UI framework, which shows up in your web browser. You can create buttons, dialogs, Markdown, 3D scenes, plots and much more. It is great for micro web apps, dashboards, robotics projects, smart home solutions and similar use cases. You can also use it in development, for example when tweaking/configuring a machine learning algorithm or tuning motor controllers.” - from the README

Michael #3: flask-ngrok

• A simple way to demo Flask apps from your machine.
• Makes your Flask apps running on localhost available over the internet via ngrok.
• Great for testing API consumers too.

  app = Flask(__name__)
  run_with_ngrok(app)  # Start ngrok when app is run
  
  # Endpoints ...
  
  if __name__ == '__main__':
    app.run()
  

Brian #4: No-async async with Python

• Will McGugan
• Allowing async while not requiring async
• Await me (maybe)
  • borrowed from Simon Willison’s The “await me maybe” pattern for Python asyncio
• Optionally awaitable
  • Providing API methods that can be called by both async and non-async code.
  • The called method really is async, but if a caller doesn’t want to know when the code is done, it can ignore the return value and not await.
• MK: I had to solve a similar problem in fastapi-chameleon
• MK: Syncify async functions.

Extras:

Brian:

• PyPI has a blog
• Docker no longer sunsetting free team plan

Jokes:

• Long-lived software
• cov.readthedocs.io/en/latest/markers-fixtures.html">Mysteries make life more interesting
  • last paragraph, discussing the cov fixture of pytest-cov

About the show

Sponsored by Microsoft for Startups Founders Hub.

Connect with the hosts

• Michael: @mkennedy@fosstodon.org
• Brian: @brianokken@fosstodon.org
• Show: @pythonbytes@fosstodon.org

Join us on YouTube at pythonbytes.fm/live to be part of the audience. Usually Tuesdays at 11am PT. Older video versions available there too.

Brian #1: zipapp

• Part of standard library since 3.5
• Yet another thing I learned recently from Brett Cannon
• “This module provides tools to manage the creation of zip files containing Python code, which can be executed directly by the Python interpreter. The module provides both a Command-Line Interface and a Python API.”
• Including: Creating Standalone Applications with zipapp

Michael #2: Reverse engineering the Apple News app with #python and #nerd power

• As we navigate the digital world, we often come across articles we don't have time to read but still want to save for later.
• One way to accomplish this is by using the Read Later feature in Apple News.
• But what if you want to access those articles outside the Apple News app, such as on a different device or with someone who doesn't use Apple News?
• Or what if you want to automatically post links to those articles on your blog? That's where the nerd powers come in.
• The linked article shows how to use Python to solve your own problem
• Leading to Rhet Turnbull’s CLI: apple-news-to-sqlite

Brian #3: What is a context manager?

• Trey Hunner
• Also look at all the cool goodies in contextlib from standard library
  • @contextmanager
  • closing
  • suppress
  • redirect_stdout, redirect_stderr
  • chdir

Michael #4: nox-poetry: Use Poetry inside Nox sessions

• via 2 people: John Hagen and Marc Prewitt
• This package provides a drop-in replacement for the nox.session decorator, and for the nox.Session object passed to user-defined session functions.
• Comes from Claudio Jolowicz's hypermodern python cookiecutter
  • Covered this on Talk Python: talkpython.fm/episodes/show/362/hypermodern-python-projects
• This session performs the following steps:
  • Build a wheel from the local package.
  • Install the wheel as well as the pytest package.
  • Invoke pytest to run the test suite against the installation.
• Consider what would happen in this session if we had imported @session from nox instead of nox_poetry:
  • Package dependencies would only be constrained by the wheel metadata, not by the lock file. In other words, their versions would not be pinned.
  • The pytest dependency would not be constrained at all.
  • Poetry would be installed as a build backend every time.

Extras

Brian:

• Sharing is Caring: Sharing pytest fixtures talk availabe at about 2:40:58 on Day 2 video of PyCascades 2023.
  • Also full Day 1 and Day 2

Michael:

• Wired connection to remote mesh router == wow!
  • Using the Linksys Atlas Max 6E

Joke: UnsafeWarnings

About the show

Sponsored by Compiler Podcast from Red Hat.

Connect with the hosts

• Michael: @mkennedy@fosstodon.org
• Brian: @brianokken@fosstodon.org
• Show: @pythonbytes@fosstodon.org

Join us on YouTube at pythonbytes.fm/live to be part of the audience. Usually Tuesdays at 11am PT. Older video versions available there too.

Michael #1: xml.readthedocs.io/en/latest/">pydantic-xml extension

• via Ilan
• Recall untangle. How about some pydantic in the mix?
• pydantic-xml is a pydantic extension providing model fields xml binding and xml serialization / deserialization. It is closely integrated with pydantic which means it supports most of its features.

Brian #2: How virtual environments work

• Brett Cannon
• This should be required reading for anyone learning Python.
  • Maybe right after “Hello World” and right before “My first pytest test”, approximately.
• Some history of environments
  • Back in the day, there was global and your directory.
• How environments work
  • structure: bin, include, and lib
  • pyvenv.cfg configuration file
• How Python uses virtual environments
• What activation does, and that it’s optional.
  • Yes, activation is optional.
• A new project called microvenv that helps VS Code.
  • Mostly to fix the “Debian doesn’t ship python3 with venv” problem.
  • It doesn’t include script activation stuff
  • It’s super small, less than 100 lines of code, in one file.

Michael #3: DbDeclare

• Declarative layer for your database.
• https://raaidarshad.github.io/dbdeclare/guide/controller/#example
• Sent in by creator raaid
• DbDeclare is a Python package that helps you create and manage entities in your database cluster, like databases, roles, access control, and (eventually) more.
• It aims to fill the gap between SQLAlchemy (SQLA) and infrastructure as code (IaC).
• You can:
  • Declare desired state in Python
  • Avoid maintaining raw SQL
  • Tightly integrate your databases, roles, access control, and more with your tables
• Migrations like alembic coming too.

Brian #4: Testing multiple Python versions with nox and pyenv

• Seth Michael Larson
• This is a cool “what to do first” with nox.
• Specifically, how to use it to run pytest against your project on multiple versions of Python.

• Example noxfile.py is super small

      import nox
  
      @nox.session(python=["3.8", "3.9", "3.10", "3.11", "3.12", "pypy3"])
      def test(session):
          session.install(".")
          session.install("-rdev-requirements.txt")
          session.run("pytest", "tests/")
  

• How to run everything, nox or nox -s test.

• How to run single sessions, nox -s test-311 for just Python 3.11
• Also how to get this to work with pyenv.
  • pyenv global 3.8 3.9 3.10 3.11 3.12-dev
• This reminds me that I keep meaning to write a workflow comparison post about nox and tox.

Extras

Michael:

• GitHub makes 2FA mandatory next week for active developers
• New adventure bike [bytes-static.nyc3.digitaloceanspaces.com/IMG_0205.jpeg">image 1, bytes-static.nyc3.digitaloceanspaces.com/IMG_1002.jpeg">image 2].
  • Who’s got good ideas for where to ride in the PNW?
  • Wondering why I got it, here’s a fun video.

Joke: Case of the Mondays

About the show

Sponsored by Microsoft for Startups Founders Hub.

Connect with the hosts

• Michael: @mkennedy@fosstodon.org
• Brian: @brianokken@fosstodon.org
• Show: @pythonbytes@fosstodon.org

Join us on YouTube at pythonbytes.fm/live to be part of the audience. Usually Tuesdays at 11am PT. Older video versions available there too.

Brian #1: classification.html">Data Classification : Does Python still have a need for class without @dataclass?

• Glyph
• dataclasses have been in the the language since 3.7
  • That’s pretty much all modern Python, right?
• “…, is there any point to having non-@dataclass classes any more? Is there any remaining justification for writing them in new code?”
• Options:
  • class just becomes a dataclass if you have typehinted members in it.
  • data instead of class, to avoid decorators

Michael #2: PyGWalker

• Turn your pandas dataframe into a Tableau-style User Interface for visual analysis.
• Works with pandas and polars
• Open-source alternative to Tableau
• It allows data scientists to analyze data and visualize patterns with simple drag-and-drop operations.

Brian #3: An opinionated Python boilerplate

• Duarte O.Carmo
• Tools and processes for new projects
• pip-tools - Pip-tools strikes the right balance between simplicity, effectiveness, and speed.
  • especially for generating pinned requirements.txt files, if necessary
• pyproject.toml - for configuration. packaging, but also any tool that supports it.
• ruff
• black, isort
• no pre-commit hooks, just run it in CI

Michael #4: Front Matter VS Code

• via Mark Little
• If you have content that supports frontmatter and is markdown-based, check this out.
• Stay in your editor and easily create, manage, and publish content.
• Don’t make front matter mistakes
  • When was it published? What is the timezone text formatting again?
• Learn new features of your existing static site (e.g. article image)
• Manage images and more.

Extras

Brian:

• VSCode improves IntelliSense support for pytest in Feb release

Michael:

• AI search wars get weird
• Proton Drive is Out of Beta, Available for Everyone

Joke:

• system-calls-in-beos.html?utm_source=pocket_saves">Is your computer on? Is it on fire?

About the show

Sponsored by Microsoft for Startups Founders Hub.

Connect with the hosts

• Michael: @mkennedy@fosstodon.org
• Brian: @brianokken@fosstodon.org
• Show: @pythonbytes@fosstodon.org

Join us on YouTube at pythonbytes.fm/live to be part of the audience. Usually Tuesdays at 11am PT. Older video versions available there too.

Michael #1: Python Parquet and Arrow: Using PyArrow With Pandas

• Parquet is an efficient, compressed, column-oriented storage format for arrays and tables of data.
• Less wrangle-able than Pandas, but way faster and lower memory
• Questions answered
  • Can we use Pandas DataFrames and Arrow tables together, and if so, how is this done? (It turns out the answer is yes, and it’s quite simple, as we’ll see).
  • In what ways are Arrow tables “better” than Pandas DataFrames? In other words, for which tasks are Arrow tables better suited? Conversely, what tasks are possible or easy in Pandas that are difficult or impossible in Arrow?
  • As an on-disk format, how does Parquet compare to popular alternatives such as feather, orc, CSV, etc.?

Brian #2: FastAPI-Filter

• Arthur Rio
• Add query string filters to your api endpoints and show them in the swagger UI.
• The supported backends are SQLAlchemy and MongoEngine.
• filter.netlify.app/">FastAPI-Filter documentation
• The philosophy of fastapi_filter is to be very declarative. You define the fields you want to be able to filter on as well as the type of operator, then tie your filter to a specific model.
• default filters: neq, gt, gte, in, isnull, lt, lte, not/ne, not_in, nin, like/ilike
• The swagger support is actually quite cool.

Michael #3: 12 Python Decorators to Take Your Code to the Next Level

• Decorators are awesome
• This is mostly home-grown decorators, but some standard ones too
• Notable ones:
  • @warps
  • @lru_cache
  • @repeat
  • @timeit
  • @retry ← no please use tenacity
  • @countcall
  • @rate_limited
  • @dataclass
  • @register
  • @property
  • @singledispatch

Brian #4: PyHamcrest

• Contributed by Txels
• PyHamcrest is a framework for writing matcher objects, allowing you to declaratively define “match” rules.
• PyHamcrest tutorial
• Having a tool that allows you to pick out precisely the aspect under test and describe the values it should have, to a controlled level of precision, helps greatly in writing tests that are “just right.”
• From Brian: I’ve been reluctant to try matcher style assertion helper libraries, as, with pytest, assert works just fine. However, I can see cases where PyHamcrest assertions could help test readability, and that’s always a win.
• Examples:
  • equality: assert_that(theBiscuit, equal_to(myBiscuit))
  • exceptions: assert_that(calling(parse, bad_data), raises(ValueError))
  • async: assert_that(``**await** resolved(future), future_raising(ValueError))
  • boolean: assert_that(theBiscuit.isCooked())
• There’s predefined matchers for
  • objects, numbers, text, logical checks, dequences, dictionaries

Extras

Brian:

• pytest tips and tricks - recent post, and discussion on upcoming Talk Python episode
• sharing pytest fixtures - placeholder page where I’ll share slides and code after my talk.

Michael:

• 3112-python-31010-and-3120-alpha.html">Python runtime updates
• Django 4.2 beta 1 released

Joke: A group of developers is called …

About the show

Sponsored by Compiler Podcast from Red Hat. Connect with the hosts

• Michael: @mkennedy@fosstodon.org
• Brian: @brianokken@fosstodon.org
• Show: @pythonbytes@fosstodon.org
• Special guest, Erin Mullaney: @erinrachel@fosstodon.org

Join us on YouTube at pythonbytes.fm/live to be part of the audience. Usually Tuesdays at 11am PT. Older video versions available there too.

Brian #1: Use TOML for .env files?

• Brett Cannon
• .env files are used to store default settings that can be overridden by environmental variables.
• Possibly brought on by twelve-factor app design.
• Supported by python-dotenv, which is also used by pydantic, pipenv, and others.
• One issue is that it’s not a defined standard.
  • from python-dotenv docs “The format is not formally specified and still improves over time. That being said, .env files should mostly look like Bash files.”
• Adafruit decided that an upcoming CircuitPython will use TOML as the format for settings.toml files, which are to be used mostly how .env files are being used.
• Brett notices this may fix things for Python for VS Code, and other people as well.
• So… Is this a good idea? I think so.

Michael #2: Pydantic gets serious funding

• via Mark Little (was on episode 285)
• Sequoia backs open source data-validation framework Pydantic to commercialize with cloud services.
• Pydantic Services Inc. emerges from stealth today with $4.7 million in seed funding.
• Pydantic’s new commercial entity will incorporate a swath of new tools and services that are both “powered-by and inspired-by the Pydantic library”
• Pydantic will start with an initial team of six, with the first three engineers based in Montana, Chicago and Berlin.
• “With $4.7 million in the bank, Colvin said that they’re continuing to rewrite parts of Pydantic in Rust, with a view toward making it more efficient via a ten-fold performance improvement.”

Erin #3: JSON Fields for performance (Denormalization)

• David Stokes
• Using JSON fields when you design your databases is a good way to improve database query performance.

Brian #4: f-strings with pandas and Jupyter keyboard shortcuts

• Kevin Markham
• After a couple year break from blogging, friend of the show Kevin Markham has a couple great, short, useful posts.
• How to use Python's f-strings with pandas
  • My favorite bit is the part about using f-strings for dictionary keys
• Fly through Jupyter with keyboard shortcuts 🚀
  • I’m a sucker for a rocket emoji
  • Not an overwhelming list. Just the essentials for even the casual Jupyter user.
  • Examples
    • Esc and Enter for command mode/edit mode
    • a and b for creating a new cell above or below current cell.
    • m and y for changing the cell type to Markdown or code.
    • Shift+m to merge cells
    • so many more
-

Michael #5: BioGPT

• “GPT” for biomedical text generation and mining
• As motivation, let’s see what ChatGPT can do with arrow anti-patterns in Python.
• Smaller models and “Large” models
• Used via an API rather than chat style.
• BioGPT has also been integrated into the Hugging Face transformers library too
• Play with it here.

Erin #6: Code Mentorship and Communicating with Newer Devs

• Sheena O’Connell
• Sheena O’Connell gave a talk at DjangoCon about her work at Umuzi, training unemployed young people in underserved communities in Africa and also was on Django Chat Podcast.
• Dmitriy Chukhin
• Caktus Group is trying a new mentorship program for folks who don’t have the necessary training.

Extras:

Michael:

• News is, these are no loner news: Security Researchers Uncover 700+ Malicious Open-Source Packages in npm and PyPI
• Git security vulnerabilities announced, again
• git ignores
  • https://github.com/github/gitignore
  • https://gitignore.io

Erin:

• DjangoCon is in October in Durham, NC this year (Oct 15-20)

Joke:

• Remember your pointers?

About the show

Sponsored by Microsoft for Startups Founders Hub.

Connect with the hosts

• Michael: @mkennedy@fosstodon.org
• Brian: @brianokken@fosstodon.org - may be a minute or two late.
• Show: @pythonbytes@fosstodon.org
• Special guest: Pamela Fox - @pamelafox@fosstodon.org

Join us on YouTube at pythonbytes.fm/live to be part of the audience. Usually Tuesdays at 11am PT. Older video versions available there too.

Michael #1: camply

• A tool to find campsites at sold out campgrounds through sites like recreation.gov and Yellowstone
• Finding reservations at sold out campgrounds can be tough.
• Searches the APIs of booking services like recreation.gov (which indexes thousands of campgrounds across the USA) to continuously check for cancellations and availabilities to pop up.
• Once a campsite becomes available, camply sends you a notification to book your spot!

• Want to camp in a tower in California?

  camply campgrounds --search "Fire Lookout Towers" --state CA

Brian #2: hatch-fancy-pypi-readme

• Your ✨Fancy✨ Project Deserves a ✨Fancy✨ PyPI Readme! 🧐
• Hynek Schlawack
• Include lots of extras in a README.md
  • text fragments
  • files, like AUTHORS.md or Changelog.md, with custom start, stop, pattern includes, etc.
  • regular expression substitutions
• Several projects with examples, including black.

Pamela #3: Pyodide dev branch now supports 3.11

• Python 3.11 PR
• Benchmark Py3.11 and Py3.10
• pyodide console
• TODO list for 0.23.0 alpha release
• this.com">Dis-this: specializing adaptive interpreter
• Recursion visualizer

Michael #4: EU hates open source?

• via Pamphile Roy
• The Cyber Resilience Act (CRA) is an interesting and important proposal for a European law that aims to drive the safety and integrity of software
• The proposal includes a requirement for self-certification by suppliers of software to attest conformity with the requirements of the CRA including security, privacy and the absence of Critical Vulnerability Events (CVEs).
• We recognize that the European Commission has framed an exception in recital 10 attempting to ensure these provisions do not accidentally impact Open Source software.
• However, drawing on more than two decades of experience, we at the Open Source Initiative can clearly see that the current text will cause extensive problems for Open Source software.
• Since the goal is to avoid harming Open Source software this goal should be stated at the start of the paragraph as the rationale, replacing the introductory wording about avoiding harm to "research and innovation" to avoid over-narrowing the exception.
• The reference to "non-commercial" as a qualifier should be substituted. The term “commercial” has always led to legal uncertainty for software and is a term which should not be applied in the context of open source
• OSI recommends further work on the Open Source exception to the requirements within the body of the Act to exclude all activities prior to commercial deployment of the software and to clearly ensure that responsibility for CE marks does not rest with any actor who is not a direct commercial beneficiary of deployment.

Brian #5: So, Single (‘) or Double (“) Quotes in Python?

• Marcin Kozak
• PEP8 doesn’t recommend anything.
• REPL uses single quotes. >>> x = "one" >>> x 'one'
• Black sides with “double quotes”, due to the apostrophe in the string problem.
  • 'Don\'t be so sad.' vs “Don’t be sad.”
• You get to pick, and don’t be bullied by black-fanatics.
• There’s always blue, which is just like black, but
  • defaults to single-quotes
  • line length defaults to 79, not black’s 88.
  • preserves whitespace before hash marks for right hanging comments (so multiple lines can line up).

Pamela #6: Frozen-Flask

• Pamela’s PR for moving to Frozen Flask
• Stepping down as a maintainer

Extras

Brian:

• What does everyone think of GitHub pricing?

Michael:

• Much much better transcripts, for example, this episode.
  • Means our search works way better too
• The AI search wars have begun - Google Panics Over ChatGPT [The AI Wars Have Begun] video
  • Microsoft Bing rockets to the top of the App Store after announcing ChatGPT integration
  • 28b8-59b9-8f68-a99ab001a6c6.html">Google shares lose $100 billion after company's AI chatbot makes an error during demo
• Free PyCharm for all the Talk Python customers
• Thanks for the help with finding a good Flutter dev.
• Important Talk Python episode: Fusion Ignition Breakthrough and Python

Pamela:

• Github pyproject.toml support.
• Python Package Template

Jokes:

• $McTitle
• Worst input fields

About the show

Sponsored by Microsoft for Startups Founders Hub.

Connect with the hosts

• Michael: @mkennedy@fosstodon.org
• Brian: @brianokken@fosstodon.org
• Show: @pythonbytes@fosstodon.org
• Special guest: @calvinhp@fosstodon.org

Join us on YouTube at pythonbytes.fm/stream/live to be part of the audience. Usually Tuesdays at 11am PT. Older video versions available there too.

Brian #1: Packaging Python Projects

• Tutorial from PyPA
• This is a really good starting point to understand how to share Python code through packaging.
• Includes discussion of
  • directory layout
  • creating package files, LICENSE, pyproject.toml, README.md, tests and src dir
  • how to fill out build-system section of pyproject.toml
    • using either hatchling, setuptools, flit, or pdm as backends
  • metadata
  • using build to generate wheels and tarballs
  • uploading with twine
• However
  • For small-ish pure Python projects, I still prefer flit
    • flit init creates pyproject.toml and LICENSE
      • will probably still need to hand tweak pyproject.toml
    • flit build replaces build
    • flit publish replaces twine
  • The process can be confusing, even for seasoned professionals.
• Further discussion later in the show

Michael #2: untangle xml

• Convert XML to Python objects
• Children can be accessed with parent.child, attributes with element['attribute'].
• Call the parse() method with a filename, an URL or an XML string.
• Given this XML:

      [HTML_REMOVED]
      [HTML_REMOVED]
        [HTML_REMOVED]
      [HTML_REMOVED]
  

Access the document:

    obj.root.child['name'] # u'child1'

• A little cleaner that ElementTree perhaps.

Calvin #3: lang.blogspot.com/2023/02/mypy-10-released.html">Mypy 1.0 Released

• Mypy is a static type checker for Python, basically a Python linter on steroids
• Started in 2012 and developed by a team at Dropbox lead by https://github.com/JukkaL
• What’s New?
  • New Release Numbering Scheme
    • not using symver
    • Significant backward incompatible changes will be announced in the blog post for the previous feature release
    • feature flags will allow users to upgrade and turn on the new behavior
  • Mypy 1.0 is 40% faster than 0.991 against the Dropbox internal codebase
    • 20 optimizations included in this release
  • Mypy now warns about errors used before definition or possibly undefined variables
    • for example if a variable is used outside of a block of code that may not execute
  • Mypy now supports the new Self type introduced in PEP 673 and Python 3.11
  • Support ParamSpec in Type Aliases
  • Also, ParamSpec and Generic Self types are no loner experimental
  • Lots of Miscellaneous New Features
  • Fixes to crashes
  • Support for compiling Python match statements introduced in Python 3.10

Brian #4: Thoughts on the Python packaging ecosystem

• Pradyun Gedam
• Some great background on the internal tension around packaging.
• Brian’s note: in the meantime
  • people are struggling to share Python code
  • the “best practice” answer seems to shift regularly
  • this might be healthy to arrive at better tooling in the long term, but in the short term, it’s hurting us.
• From the article:
  • The Python packaging ecosystem unintentionally became the type of competitive space that it is today.
  • The community needs to make an explicit decision if it should continue operating under the model that led to status quo.
  • Pick from N different tools that do N different things is a good model.
  • Pick from N ~equivalent choices is a really bad user experience.
  • Picking a default doesn’t make other approaches illegal.
  • Communication about the Python packaging ecosystem is fragmented, and we should improve that.
• Pradyun: “Many of the users who write Python code are not primarily full-time software engineers or “developers”.”
• from Thea: “The reason there are so many tools for managing Python dependencies is because Python is not a monoculture and different folks need different things.”
• opening up the build backend through pyproject.toml-based builds was good
• but the fracturing of multiple “workflow” tools seems bad.
• “I am certain that it is not possible to create a single “workflow” tool for Python software. What we have today, an ecosystem of tooling where each makes different design choices and technical trade-offs, is a part of why Python is as widespread as it is today. This flexibility and availability of choice is, however, both a blessing and a curse.”
• On building a default workflow tool around pip
  • interesting idea
• There’s tension between “we need a default workflow tool” and “unix philosophy: many focused tools that can work together”.

Michael #5: Top PyPI Packages

• A monthly dump of the 5,000 most-downloaded packages from PyPI.
• Also, a full copy of PyPI info too: github.com/orf/pypi-data

Calvin #6: SQLAlchemy 2.0 Released

• #57 on the Top PyPI Packages 😸
• Will be giving a SQLAlchemy tutorial at Python Web Conf
• What’s New?
  • Significant API change from 1.4
  • You’ll want to follow the migration guide and see also the what’s new in 2.0 guide
  • Fully takes advantage of Python 3 features such as dataclasses, enums and inline annotations
  • Typing support in Core and ORM, but still should be considered beta
    • all SQLAlchemy stubs packages must be uninstalled all SQLAlchemy stubs packages must be uninstalled for typing to work
    • Mypy Plugin is considered deprecated now
  • Major speed increase in the all new fully ORM-integrated bulk INSERTs
    • sorry if you are on MySQL, they don’t support INSERT RETURNING yet
    • but MariaDB does support this
  • All new bulk optimized schema reflection architecture
    • Currently enabled for PostgreSQL and Oracle
    • 250% perf increase for Postgres
    • 900% per increase for Oracle
  • Native extensions ported to Cython
    • C extensions have been replaced by Cython
    • Benchmarks as fast or sometimes faster than the previous C extensions
    • Removes some risk of memory or stability issues introduced by C
  • SQLAlchemy is now pep-517 enabled and has a pyproject.toml at the root
    • means that local source building with pip can auto install the Cython dependancy

Extras

Brian:

• Nothing to share yet, but I’m building a new alternative Python build backend.
  • which if course will be followed with a new workflow tool that follows “my workflow”.

Michael:

• “Create shortcut: New window” tip:
  • python-static.nyc3.digitaloceanspaces.com/window-apps.png">In the dock/task bar
  • python-static.nyc3.digitaloceanspaces.com/proton-app.png">Running as an app
• Speaking of Proton, started using simplelogin.io
• What’s all this banning chips about? Great documentary
• Talk Python is hiring!

Calvin:

• 5th Annual Python Web Conf 2023